type TBitmapFlag int
const (
  BITMAP_FLAG_NONE TBitmapFlag = C.BITMAP_FLAG_NONE
  BITMAP_FLAG_OPAQUE TBitmapFlag = C.BITMAP_FLAG_OPAQUE
  BITMAP_FLAG_IMMUTABLE TBitmapFlag = C.BITMAP_FLAG_IMMUTABLE
  BITMAP_FLAG_TEXTURE TBitmapFlag = C.BITMAP_FLAG_TEXTURE
  BITMAP_FLAG_CHANGED TBitmapFlag = C.BITMAP_FLAG_CHANGED
  BITMAP_FLAG_PREMULTI_ALPHA TBitmapFlag = C.BITMAP_FLAG_PREMULTI_ALPHA
  BITMAP_FLAG_LCD_ORIENTATION TBitmapFlag = C.BITMAP_FLAG_LCD_ORIENTATION
  BITMAP_FLAG_GPU_FBO_TEXTURE TBitmapFlag = C.BITMAP_FLAG_GPU_FBO_TEXTURE
)
